221452143 has 48 divisors (see below), whose sum is σ = 336832608. Its totient is φ = 129254400.

The previous prime is 221452129. The next prime is 221452151. The reversal of 221452143 is 341254122.

It is not a de Polignac number, because 221452143 - 2¹² = 221448047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221452103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1616371 + ... + 1616507.

It is an arithmetic number, because the mean of its divisors is an integer number (7017346).

Almost surely, 2^221452143 is an apocalyptic number.

221452143 is a deficient number, since it is larger than the sum of its proper divisors (115380465).

221452143 is a wasteful number, since it uses less digits than its factorization.

221452143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 285 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 221452143 is about 14881.2681919250. The cubic root of 221452143 is about 605.0063911171.

The spelling of 221452143 in words is "two hundred twenty-one million, four hundred fifty-two thousand, one hundred forty-three".